Antarctica has only two native flowering plants, and both have spent years facing a warmer environment.
asserted
both → have → environment
A new seven-year field study found that Antarctic hairgrass (Deschampsia antarctica) and Antarctic pearlwort (Colobanthus quitensis) responded to long-term warming in different ways.
asserted
hairgrass → find → ways
Researchers placed open-top chambers around plants on King George Island to create warmer conditions and compared them with plants growing outside the chambers.
asserted
Researchers → place → chambers
According to research published in Physiologia Plantarum titled ‘
Contrasting Hydraulic-Photosynthetic Strategies Sustain Antarctic Vascular Plants Under Long-Term Warming’, the two species followed contrasting physiological pathways under sustained warming.
uncertain
species → accord → warming
How did Antarctica’s two flowering plants respond to long-term warming
asserted
plants → flower → warming
According to the BBC Wildlife, Antarctica is home to just two native vascular plants: Antarctic hairgrass and Antarctic pearlwort.
uncertain
Antarctica → accord → plants
Both are small plants that grow in wet, protected spaces between rocks, with clumps reaching around 5 cm in height.
asserted
that → grow → height
In 2012, researchers began a seven-year experiment on King George Island, an island just north of the Antarctic Peninsula, to understand how these plants respond to long-term warming.
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plants → begin → warming
They set up plots and placed open-top chambers around some of the plants.
asserted
They → set → plants
The chambers passively warmed the air inside by several degrees, while plants outside them remained under natural conditions for comparison.
asserted
plants → warm → comparison
The experiment continued for seven years.
asserted
experiment → continue → years
During this time, researchers examined leaf hydraulic traits, xylem anatomy, and photosynthetic performance in both species.
asserted
researchers → examine → species
They also recorded changes in freeze-thaw events during the study period.
asserted
They → record → period
PC: BBC Wildlife
Antarctic hairgrass reduced water transport and photosynthesis
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hairgrass → reduce → transport
After seven years under the warming chambers, Antarctic hairgrass showed reduced leaf hydraulic conductivity and reduced photosynthetic rate compared with plants under natural conditions.
asserted
hairgrass → show → conditions
The study linked these changes to outside-xylem modulation and likely senescence associated with more frequent freeze-thaw events inside the chambers.
asserted
study → link → chambers
Antarctic pearlwort, exposed to the same warming treatment, responded differently.
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pearlwort → expose → treatment
Its leaf hydraulic conductivity and photosynthetic rate both increased.
asserted
conductivity → increase → ?
The species also showed greater cell wall elasticity, along with enhanced water transport and carbon dioxide diffusion, triggered by changes in vascular anatomy and by a growth form that favors heat conservation.
asserted
that → show → conservation
The two Antarctic plants adapted differently to long-term warming
The two plants did not use the same response to long-term warming.
asserted
plants → adapt → warming
Antarctic hairgrass reduced hydraulic conductivity and photosynthesis, while Antarctic pearlwort increased both.
asserted
pearlwort → reduce → both
The researchers described these responses as complementary adaptive pathways.
asserted
researchers → describe → pathways
Both species showed structural and ultrastructural leaf adjustments that supported tight coordination between hydraulics and photosynthesis.
asserted
that → show → hydraulics
In Antarctic hairgrass, the reductions were linked to outside-xylem modulation and likely senescence.
asserted
reductions → link → modulation
In Antarctic pearlwort, changes included greater cell wall elasticity, enhanced water transport and carbon dioxide diffusion, along with changes in vascular anatomy.
asserted
changes → include → anatomy
Seven years of warming revealed different responses in two Antarctic plants
The seven-year experiment provides a long-term view of how Antarctica’s two native vascular plants respond to sustained warming in the field.
asserted
plants → reveal → field
The researchers found that both species maintained coordination between leaf hydraulics and photosynthesis, but their responses differed.
asserted
responses → find → hydraulics
Antarctic hairgrass followed a more conservative pathway, with lower hydraulic conductivity and photosynthetic rate after warming.
asserted
hairgrass → follow → warming
Antarctic pearlwort showed greater hydraulic conductivity and photosynthetic capacity, along with increased cell wall elasticity and water and carbon dioxide transport.
asserted
pearlwort → show → elasticity
The findings show that warming does not produce one uniform response across the two species.
asserted
warming → show → species
Instead, each species adjusted through a different set of physiological and structural changes.
asserted
species → adjust → changes
The study describes these contrasting pathways as part of a shared adaptive continuum in Antarctica today.
asserted
study → describe → Antarctica
The Aporia
